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Fair value measurements - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Aug. 07, 2020
Debt Instrument [Line Items]
Business combination, contingent consideration, liability, current	$ 0.0		$ 2.7
Warrant
Debt Instrument [Line Items]
Fair value of the liability at issuance	13.4
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value	$ 13.9	$ 0.0
Series I Warrants
Debt Instrument [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)	1.0
Class of warrant or right, exercise price of warrants or rights	$ 9.8802
Series II Warrants
Debt Instrument [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)	1.5
Class of warrant or right, exercise price of warrants or rights	$ 15.7185
Senior Unsecured Notes Due August 2028 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate percentage	3.875%		3.875%	3.875%
Long-term debt, fair value	$ 343.1		$ 184.3